to leave a group of people at random times to masturbate, then come back out of breath and play it off like nothing happened
John: "yo tom! where you at?"
5 minutes later
Tom: " sorry man i was running a marathon"
by South Wick September 07, 2010
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When you become extreamly intoxicated off of captin morgan and passes out in someones trailer. Then that person is awoken by his friends 3 hours later and goes snowboarding. This is know as Running a Marathon
"i wanna run a marathon" said bones
by beef April 17, 2005
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A female with an exceptionally nice ass.

Derived from the term "its a tight race".
"Damn... she has a nice ass"
"Yeah man, she's running the marathon"
by Robert Schinkleheimerjosefinem December 03, 2008
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